Using NRF24L01+ with pure assembler programing

Question

Dear people I have connected NRF24!01+ with PIC16F1826 for use as PRX and have also another similar for PRX For an initial test I tryed to trasmit a closed / open switch state to a LED and as ussually hapens it does not work Also I have a Tx packets each 200ms with one Data byte incremented in each Tx I get SPI write an read ok but at PRX have not getting any received packet There is the same program for PTX an PRX with #define PRX o rnot at compiling so most of defined values are the same What I get reading with SPI : in PRX , Reg 0x17 FIFO_STATUS bit4 TX_EMPTY: is 1 before loading data 0 after loading payload (4 bytes) 1 after CE goes H At PRX side not IRQ arises , not changes in Reg 07 bit RX_DR I only use assembler programming and I didn´t found in the web any complete and working assembler example. --> I am asking please the simplest example with a detailed list of commands to send for configuring and useing TPX and PRX, similar at Appendix B, pag 77 in NRF24L01+ data sheet. 
 *** But please include the waiting delays and other instructions that may be needed *** For some address, default values may be used in a first test ? ( only 1 Pipe ) Is it posible not using CRC ? I need to have something working before going to a complete use of full NRF24L01+ capabilities Finally I will insert well tested software in bigger assembler programs I like to replace a RS485 conexion with this RF link I will 1452.Control_NRF.rar send the assembler that I am testing if somebody like to see it, but RF part is not working Waiting some help, Best Regards, Osvaldo Hojvat

o.hojvat · Accepted Answer

I undestand well tis matter. 
 I will ask about some to specific questions that may be not usefull for other people , I guess it will better to no use the forum. 
 Anyway yo can go back this to public tickets if consider there may be usefull for other peoples. 
 I will begin with one order from one PTX to the PRX inside the handheld unit program but I am thinking in advance for posible problems with other orders received at central unit 
 Basically a handheld must have updated information before sending an order. 
 So at the moment I find 3 aproach: 
 1) Using the proposed star 1PRX to up to 6 PTX, as in data sheet 
 In this case the PRX does not knows which PTX will send the next packet and can not upload the regarding information in ack payload. The PTX may repeat the Tx in a very short time to get it. 
 2) each PTX can use a diferent frequency channel and the PRX may be receiving about 20 ms at one freq. and if there is no received packet, PRX moves to other diferent freq. not adyacent channel). 
 Please answer if there are posible interference for 2 PTX trasmiting at the same time but diferent frequency. 
 3) One PTX and up to 6 PRX devices (one in each handheld). Disadvantage may be Increased battery consumption. Most probabely RFmay be OFF most of the time 
 As I am using with RS485 cable , PTX sends a short packet for each PRX and wait a short time for a reply. If not, It moves to other PRX address 
 Best Regards

o.hojvat · Answer

I had confused in my mind about names (my memory errors) 
 PRT- -> I wanted to say PTX 
 Now I noted that are RX and TX modes with a P letter at the begining. I guess I will remember well it. 
 What is the P letter meaning? 
 And the last question is if the Tx FIFOs used in PTX mode are the same Tx FIFOs used for ACK_PAYLOAD in a PRX mode device, so the the informations about Tx FIFO full or empty are in register 0x17 for both cases. 
 In data sheet page 62 there are mention of ACK_PLD TX_PLD RX_PLD as not numbered registers or FIFOs. 
 After several days I may have RFcomunication working in the proyect and more information and questions. 
 I will send it in a new ticket, as you sugested. 
 Best Regards, Osvaldo

Using NRF24L01+ with pure assembler programing

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